2.0 Analysis 2.1 Introduction The flight was in cruise at FL330 and was proceeding normally; the captain was the pilot at the controls and was performing routine navigation tasks. The analysis will deal with the autopilot event that triggered the flight-upset event, the subsequent reaction of the aircraft and the crew, as well as the recovery and post-recovery portions of the flight and the return to cruise flight. Maintenance events prior to, and after, the flight upset will also be discussed. 2.2 Autopilot Disconnect Autopilot 2 (CMD2) was in use at the time of the start of the upset event. The captain was using the FMS in the NAV mode and had just entered the oceanic boundary point SCROD in the FMS and was in the process of looking at the CDU to note the new estimate, as requested by the air traffic controller. At that point, the captain heard a whooshing sound which seemed like the noise created by turbulence; at the same time, the autopilot disengaged and the aircraft began to pitch up.